Okay, imagine you have a special secret code that you like to use to protect your things, like your toys or your snacks. Bring your own encryption means that when you go somewhere else, like a friend's house or school, you bring your secret code with you to protect your things there too.
In the grown-up world, when people talk about bring your own encryption, they are talking about a way to protect information they share with other people or store on their computer or phone. It's like a secret code that only they know, and it makes sure that their information stays safe and private.
When you bring your own encryption, you don't have to rely on other people or companies to keep your information safe. You get to use your own special code to protect it, just like you protect your toys or snacks with your secret code. This way, only you or the people you trust can see your information, and nobody else can read it or use it without your permission.
So, bring your own encryption is kind of like bringing your own secret code to protect yourself and your things.